Hail Resistance of Roofing ProductsBuilding Research Division, U.S. Institute for Applied Technology, 1969 - 9 pages A test was developed for evaluating the hail resistance of roofings, in which synthetic hailstones (ice spheres) of various sizes were shot at roof assemblies at their free-fall terminal v * elocities.Indentations, granule loss and roofing fracture were observed.The principal conclusion is that:All roofing materials have some resistance to hail damage, but as the size of the hail increases, a level of impact energy is reached at which damage occurs.This level lies in the range of 1 1/2 to 2 inch (3.8-5.1 cm) hailstones for most prepared roofings.(Author). |
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Page 1
... formation and growth , or storm development ; this information may be found in references [ 2-6 ] . Two types of damaging hailstorms are en- countered in the United States [ 5 ] . The most prevalent type is known as the frontal storm ...
... formation and growth , or storm development ; this information may be found in references [ 2-6 ] . Two types of damaging hailstorms are en- countered in the United States [ 5 ] . The most prevalent type is known as the frontal storm ...
Page 3
... formation can be found in the literature . Oc- 2.1 . Test Apparatus casionally reports appear in the trade literature [ 7 , 8 ] on hail damage to buildings , but only one paper has appeared in which a serious effort has been made to ...
... formation can be found in the literature . Oc- 2.1 . Test Apparatus casionally reports appear in the trade literature [ 7 , 8 ] on hail damage to buildings , but only one paper has appeared in which a serious effort has been made to ...
Page 4
... formed carriers for the several sizes of hailstones and permitted one size barrel to be used for all of the hailstones . Car- riers with recesses for 111⁄2 ( 3.8 cm ) , 2 ( 5.1 cm ) , 212 ( 6.4 cm ) and 284 in ( 7.0 cm ) hailstones were ...
... formed carriers for the several sizes of hailstones and permitted one size barrel to be used for all of the hailstones . Car- riers with recesses for 111⁄2 ( 3.8 cm ) , 2 ( 5.1 cm ) , 212 ( 6.4 cm ) and 284 in ( 7.0 cm ) hailstones were ...
Page 6
... formed significantly better , as discussed below . A Class B shingle based on a glass fiber mat , instead of the conventional organic felt , did not show felt - type failure on its tab edges and un- supported areas with hailstones ...
... formed significantly better , as discussed below . A Class B shingle based on a glass fiber mat , instead of the conventional organic felt , did not show felt - type failure on its tab edges and un- supported areas with hailstones ...
Page 7
... formed better than on the dense decks when 2 - in ( 5.1 cm ) hailstones were used , but 211⁄2 - in ( 6.4 cm ) hailstones penetrated through the roofing into the insulation . Foamboard B ( 1d ) delaminated ; i.e. , the insulation broke ...
... formed better than on the dense decks when 2 - in ( 5.1 cm ) hailstones were used , but 211⁄2 - in ( 6.4 cm ) hailstones penetrated through the roofing into the insulation . Foamboard B ( 1d ) delaminated ; i.e. , the insulation broke ...
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15 cents air gun apparatus Applied Technology areas of different Asbestos cement asphalt flood coat Asphalt Roofing asphalt shingles automatic data processing building damage Building Research Building Science Series Built-up roofs Bureau of Standards Cement and Concrete Center Class C shingle Coal tar Concrete Properties cracking cylinder dense decks dents DEPARTMENT OF COMMERCE diameter different vulnerability felt damage Fiberboard on 1-in Foamboard free-fall terminal velocity freezing ft 61 cm Gas cylinder Glass fiber insulation hail damage hail resistance hailstone carrier Hailstone Molds Hailstorms ice spheres indentation Institute for Applied interply asphalt Interrelations Between Cement Joules kg/m² kg/m³ large hailstones launcher lb/sq Meteorol microswitches National Bureau Nonbituminous Roofing organic felt polyethylene Portland Cement prepared roofings reported Resistance of Roofing resistant to hail shingles showed Sidney H sizes of hailstones slag solidly supported areas specimen steel decking substrates tested Type 235 shingles U.S. DEPARTMENT U.S. Government Printing velocity 9 ст